Handle thread IDs in panic output

[roife]

Rust 1.91 includes the OS thread ID in panic messages, for example:

thread 'aaa::bbb' (19178688) panicked at crates/a/src/b.rs:13:9:

The existing panic regexp only handled the older form without the thread ID:

thread 'aaa::bbb' panicked at crates/a/src/b.rs:13:9:

This updates rustc-panics-compilation-regexps to accept the optional thread ID.

Note: This is a backward-compatible regexp change. It keeps matching the pre-1.91 panic format and adds support for the new format with an optional thread ID.

Ref: rust-lang/rust#115746.

[Copilot]

Pull request overview

Updates rust-mode’s compilation/panic matching to support Rust 1.91’s new panic header format that optionally includes an OS thread ID (while remaining compatible with the pre-1.91 format).

Changes:

• Extend rustc-panics-compilation-regexps to accept an optional (<digits>) thread-id segment after the thread name.
• Update the existing compilation-regexp ERT test to include and assert matching of the new panic header example.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
rust-compile.el	Expands the panic regexp to optionally match the new thread 'name' (id) panicked at ... header while preserving existing capture groups.
rust-mode-tests.el	Adds a new panic line with a thread ID and updates expected matches to cover the new format.

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